This study aims to determine the application of collaborative project learning methods in PPKn subjects in grades 11-5 of SMAN 1 Kedamean Gresik. This method helps students learn in groups, while improving social and communication skills, as well as problem-solving skills. In addition, this method can make the learning process more interesting and interactive, thus encouraging students to play a more active role during the learning process. This study uses a descriptive qualitative method with data collection techniques through observation, interviews, and documentation. To ensure the accuracy of the data obtained, source triangulation and triangulation techniques are used. The data analysis techniques used with Miles and Huberman's steps are data collection, data reduc-tion, data presentation, and data verification. The results of the study show that the application of this collaborative project learning method improves learning outcomes and student involvement in learning. They are freer in discussing, developing ideas, and easier to understand PPKn learning materials. However, there are still some obstacles faced, such as the imbalance of individual roles in the group and the limited time to complete projects carried out by students.